Composite building material



July 26, 1938. E ER 2,124,921

COMPOS ITE BUILDING MATER IAL Filed Dec. 4. 1935 wood/25m wadazag coarse wood 1000K Patented July 26, 1938 UNITED STATES PATENT OFFICE COMPOSITE nmnmc MATERIAL Application December 4, 1935, Serial No. 52,821 In Yugoslavia May 3, 1935 1 Claim.

My invention relates to slabs, blocks or plates adapted for use in the erection of walls and other parts of buildings and more especially to a product of the kind aforesaid, the body of which is formed, in a manner well known per se, from a mixture of wood wool and a binder, preferably an inorganic bmder such as Portland cement. My invention also relates to the process of producing such products. It is an object of my invention to provide a product such as here defined, which is capable of wider use than similar products hitherto on the market and which can be produced in a particularly simple and inexpensive manner. In its preferred form the new product is distinguished from other products consisting of a mixture of wood wool and cement by a wider range of applicability, by' a more pleasing appearance and by other favorable properties, as will appear from the following description in which the nature of my invention will be set out with reference to the drawing aflixed to this specification and forming part thereof, in which several products embodying my invention are illustrated diagrammatically by way of example. In the drawing:

Fig. 1 is a perspective view of a plate, block or slab covered on one side with wood veneer, the body consisting of a mixture of wood wool and cement.

Fig. 2 is a side elevation of a similar product, in which both surfaces of the product are covered with a suitable covering which may be wood veneer, sheet metal, asbestos cement or some other suitable material.

Fig. 3 is a similar view of a third modification, which will be described farther below.

Referring to the drawing and first to Fig. 1, l

' is the body proper of the slab or the like, consisting ofa well known mixture of coarse wood wool in the form of an interlacing arrangement of coarse, elongated cut strands of wood and a binder of Portland cement. 2 is a layer of fine wood wool, known in the trade as wood fibre wadding in the form of a closely compacted interlacing arrangement of thin elongated cut strands of wood, the individual fibres of which' measure about 5 ms. in width and .5 mm. in thickness, being 0! any desirable length and some of them being about 500 ms. long. 3 is a layer of a suitable binder or cement and I is a sheet of wood veneer, serving as a covering.

In the production of a slab such as shown in Fig. 1 the ordinary coarse wood wool is mixed with Portland cement in a mold and, before or alter this layer has hardened, a layer 2 of wood fibre wadding to which the same or another binder is admixed is deposited thereon. The slab thus formed is of coarse texture in the body I while the layer 2 is smooth and substantially lacks all larger cavities. On this smooth surface the covering such as wood veneer is secured with the aid of an adhesive or binder such as glue or some other suitable cement or binder.

In the modification illustrated in Fig. 2, 5 is a body of coarse wood wool and cement similar to the body I shown in Fig. 1. 6,6 are layers of a mixture of wood fibre wadding and cement similar to the layer 2 in Fig. 1. 1,1 are layers of an adhesive or binder, and 8,8 are covering layers of wood, sheet metal or some other suitable covering. The modification shown in Fig. 2 is thus distinguished from that shown in Fig. 1 by the fact that both its surfaces are covered with a lrioviering of a constitution other than that of the Fig. 3 illustrates a third modification in which the body is made of two parts, 9 being the larger part consisting of a mixture of coarse wood wool and cement and being faced on one edge with a layer ll) of wood fibre wadding and cement having a fine texture and being formed with a groove or slot ll, into which may be fitted a key formed on a block or slab of similar constitution. The block or slab shown in Fig. 3 may be covered with a covering such as 4 or 8 on one or both sides.

Owing to their being formed of a mixture of wood wool and Portland cement all these blocks, slabs or plates may be worked mechanically with the aid of tools such as are used in the working of wood. They may be planed, bored or machined in any suitable manner. More especially the layer formed of wood fibre wadding and cement is capable of such treatment, being a rigid, finepored dense material in which the wooden component may advantageously predominate.

Instead of forming such products in molds, I may also produce them by rolling or the like, and I may apply lower or higher pressure according to the circumstances of each individual case.

Obviously the production of these products can be carried through in a single operation without the use of any foreign material and without necessitating any subsequent treatment. Composite bodies'formed from mixtures of wood and cement can immediately be covered with the covering material or may be worked with carpentry, joinery or like tools.

While these new products are dissimilar in outer appearance to the products made of mixtures of wood wool and cement or the like which and an interlacing t of coarse, elmgated, cut strands of wood distributed therethrough to provide a light, porous, inner mass, and a relatively thin coherent sheet lsyer oi coveringmatertflsecuredtheretocomposedo! s binder and an interlacing arrangement of thin, elongated, cut strands of wood distributed therethrough, said layer of covering material presenting asubstantiallysnoothsurfaoemdbeing substantially poreless throughout its thlcknes. HAM-IAN LEDERER. 

